<!DOCTYPE html>
<html>
<head>
	<title>A</title>
<style type="text/css">
	div
	{
		width:500px;
		height:200px;
		background:gray;
		position:relative;
	}
	.div1
	{
		width:80px;
		height:80px;
		border-bottom-right-radius:80px;
		background:yellow;
	}
	.div2
	{
		width:80px;
		height:80px;
		border-top-left-radius:80px;
		background:yellow;
		text-align:right; 
		position:absolute;
		right:0;
		bottom:0;
	}
</style>
</head>
<body>
<div>
	<div class="div1"></div>
	<div class="div2"></div>
</div>
</body>
</html>